Stop mechanism for printing-presses



5 Sheets-Sheet'I 1.

(No Model.)

T. G. DEXTER STOP MECHANISM 'FOR PRINTING PRESSES. ,No. 567 303.

'Patented sept. 8, 1896.

p mvsmon am M12:

WITNESSES.

0. X. fiwww,

; $0 ATTORNEY WASHINGTON a u (No Model.) 5 Sheets-Sheet 2. T. O. DEXTER.

STOP MECHANISM FOR PRINTING PRESSES. No. 567,303.

N N is R Q WITNESSES NV N R I N w w ATTORNEY 5 Sheets-Sheet 3' (NoModel.)

T. G. DEXTER.

STOP MECHANISM FOR PRINTING messes.

No. 567,303, Patented Sept. 8, 1896.

INVENTOR WITNESSES W, w zzi ATTORNEY @OKWM (No Model.) 5 Sheets-Sheet 4.

T. O. DEXTER.

STOP MECHANISM FOR PRINTING PRESSES.

No. 567,303. I Patented Sept. 8, 1896.

INYENTOR Wam- ATTORNEY (No Model.) 5 Sheets-Sheet 5.

T. 'O. DEXTER.

. STOP MECHANISM FOR PRINTING PRESSES. No. 567,303 Patented Sept. 8,1896.

WITNESSES INVENTOR:

aoamm wwz ATTORNEY,

. UNITED STATES,

PATENT v()EEICE.

TALBOT o. DEXTER, or PEARL RIVER, NEW YORK.

STOP MECHANISM FOR PRINTING-PRESSES.

SPECIFICATION forming part of Letters Patent No. 567,303, datedSeptember 8,1896. Application filed April 15, 1895. Serial No; 545,713.No model) To ctZZ whom it may concern:

Be it'known that I, TALBOT O. DEXTER, of Pearl River, in the county ofRockland, in the State of New York, have invented new and usefulImprovements in Automatic Stop Mechanism for Printing-Presses, of whichthe following, taken in connection with the.

injury to the press mechanism in case two or more sheets of paper arefed simultaneously to the press.

To attain the aforesaid object, I employ an automatic stop mechanismcontrolled by the paper in transit to the printing-press and preventingthe action of the impression-cylinder upon the forms on the type-bed incase no sheet is fed to the printing-press, or two or more sheets arefed simultaneously thereto, as hereinafter more fully described and setforth in the claims.

In the annexed drawings, Figure 1 is a side elevation of that portion ofa two-revolution printing-press to which my invention is applied. Fig. 2is an enlarged horizontal transverse section on line X X in Fig. 1,presenting only those parts which pertain to my invention. Fig. 3 is avertical transverse section on line Y Yin Fig. 2. Fig. 4 is a sideelevation of my invention applied to a drumpress. Fig. 5'is an enlargedhorizontal transverse section on line Z Z in Fig. a. Fig. 6 is a sideelevation showing the stop mechanism driven from the actuating-gears ofthe feedin g-machine. Fig. 7 'is a horizontal transverse section on lineIV V in Fig. 6, and Figs. 8 and 9 illustrate duplex circuit makers andbreakers arranged to prevent the closing of the circuit by the barespaces on the feed board between the successive sheets.

Similar letters and figures of .reference indicate corresponding parts.

A represents the press-frame, which may be of any shape, according tothe style of the press. B denotes the impression-cylinder; C, thefeed-board, and D the paper-feeding machine from whence the paper isconveyed over the feed-board to the impression-cylinder by means of thetraveling endless tapes a a.

To guard against the injurious results of allowing theimpression-cylinder to come in contact with the inked surfaces of theforms 011 the type-bed of the press, I employ the following automaticand electrically-controlled stop mechanism:

011 a so-called two-revolution press, as represented in Figs. 1 and 2 ofthe drawings, the impression-cylinder Bis usually lifted from thetype-bed by means of springsb b and intermittently depressed by means ofa pitman P, attached at one end to a transverse shaft 0, which forms byopposite ends the couplings of the two sets of toggle-levers c c atopposite sides of the press. One arm of each set of said levers isconnected to the press-frame and the other to a yoke C, which isfastened to the rods dd, supporting one of the journal-boxesof theimpressioncylinder, said pitman receiving motion from an arm 6,projecting from a rock-shaft e. To allow the pressman' to trip theimpressioncylinder so as to prevent it from receiving the impression ofthe forms on the type-bed when desired, the pitman is made detachablefrom the rock-arm e, for which purpose the connection of said parts ismade by a notch P in the under side of the pitman, by which notch thepitman rides on the end of the rockarm. To permit this disconnection tobe effected by the pressman, a shaft 9," parallel to the rock-shaft e,is pivoted to the frame A and has projecting from it a lever g, which,by the turning of the shaft g, pries up the pitman P. Another lever f isusually fulcrumed on the frame A and has one end extending under an armf, affixed to the side of the shaft g, as more clearly shown in Figs. 2and 3 of the drawings. The opposite or outer end of the lever f hasconnected to it a treadle f to allow said endto be depressed by the footof the pressman, by which opera ICO tion the shaft g is turned so as tocause the lever g to pry up the pitman I. This constitutes the primarystop mechanism. To effect this automatically in case the feedingmaehineD fails to supply a sheet of paper to the printing-press, I employ inconnection with the aforesaid primary stop mechanism a supplemental orauxiliary stop mechanism controlled automatically and electrically bythe transit of the paper to be fed to the printing-press, whichauxiliary stop mechanism is susceptible of many modifications in thedetails of its construction and obviously must vary with the differentstyles of printing presses to which my present invention is applied.

The automatic auxiliary stop mechanism shown in Figs. 1 and 2 of thedrawings consists of apitman H, receiving motion from either a cam or aneccentric I, by which said pitman is caused to move in unison with thepress mechanism.

Upon. the pitman II, I mount the electromagnet J, which is connectedwith the battery E. The armature J of this magnet is pivoted to thepitman and formed with the pawl J. From the shaft 9 projects a secondlever g, which the aforesaid pawl engages when the armature is attractedby the magnet, and thus the movement of the pitman II in one directioncauses the shaft g to be turned so as to lift the pitman P from therock-arm c by the lever g on said shaft, which operation deprives theiinpression-cylinder of the means for depressing it so as to receive theimpression from the inked form.

To control this auxiliary stop mechanism automatically by the transit ofthe paper to be fed to the press, I secure to the sides of thefeed-board 0 suitable standards F, in which I pivot the ends of a bar11, extending transversely over the feed-board and a proper distancetherefrom, to obviate interference with the movement of the paper on thefeed-board. Said bar is insulated from the standard for the purposehereinafter explained. To the central portion of this bar I fasten afeeler consisting of a metallic linger i, which 0011- stitutes one ofthe tern'iinals of a circuit maker and breaker, and rests normally uponthe companion terminal i, consisting of an iron or steel plate set inthe feed-board so as to be flush with the top thereof. Said terminalsare in circuit with the magnet J, which circuit is normally closed bythe feeler or finger '1'. resting upon the metal plate '11, as shown inFig. 1 of the drawings.

The movement of the feeding mechanism is so timed with the pressmechanism and the aforesaid circuit-maker is placed at such a distancefrom the gages L of the printingpress that during the time in which thesheet of paper passes to said gages the circuit is broken by the sheetpassing between the terminals t" and i, and thus the press-cylinderreceives its usual vertical movement from the press mechanismhereinbefore described.

Should, however, the feeding-machine fail to feed a sheet at therequisite time, the feeler or terminal 5 is allowed to rest upon theterminal i, and the resultant closing of the circuit energizes themagnet J and causes the armature thereof to hold the pawl J in aposition to engage the lever 9 during themovc ment of the pitman II, andthereby turn the shaft g, so as to lift by its lever g the pitman P outof engagement with the rock-arm c. This serves to automatically trip theimpression-cylinder so as to prevent its bare surface from receiving theimpression from the inked forms.

To more effectually guard against untimely or premature closing of thecircuit by the feeler or terminal 'i being allowed to drop onto theterminal i by the spaces between the successive sheets, the circuitmakers and breakers 'L" and i may be arranged one back of the other anda proper distance apart to cause one feeler i to be lifted out ofcontact with the terminal 1' by one sheet while the other feeler isallowed to drop on the subjacent terminal by the other sheet havingpassed from under said feeler, as illustrated in Figs. 8 and 9 of thedrawings. Both of said circuit makers and breakers are connected withthe battery E. I11 one of these duplex circuit makers and breakers thefeelers consi of rollers K and K, pivoted to a couplingj,which allowsthem to rise and fall independent of each other. They are confined intheir positions in relation to the subjacent terminals 2' by a rodj,connected to the end of the aforesaid coupling and to a cross-bar j,supported on standards j, secured to the sides of the feed-board.

To prevent the paper from entering the printing-press in case two ormore sheets are accidentally fed simultaneously from the feeding-machineD, I employ an auton'iatic auxiliary stop mechanism for throwing thepress out of gear or shipping the driving-belt from the tight pulley tothe loose pulley. This I preferably accomplish on a two-revo lutionpress by the following mechanism, viz: A secondary pitman II, moving inunison with the press mechanism and preferably actuated by the eccentricI, hereinbefore referred to, has mounted on it an electromagnet N, asmore clearly shown in. Figs. 2 and of the drawings. To the side of thispitman is pivoted the armature N, which is formed with the pawl 07 To asuitable support 0 on the frame A is pivoted the bell-crank or two-armedlever 0, one arm of which is in the path of the aforesaid pawl. Theother arm of said lever bears against the side of a pin or lug Z,secured to the belt-slipper bar I, which is of the usual and well-knownform. Over the center of tl1e:l:'eed-board (J, I place a circuit makerand breaker consisting of a metallic finger on, secured to a cross-barm, which is pivoted and insulated from supporl s m, mounted 011 thesides of the feed-board. A lug n projects from the rear of said crossbaradjacent to the support an", and over this lug is a set-screw n,adjustably connected to a bracket a attached to said support. Said lugnormally rests 011 the lower end of the set-screw, by which latter thefree end of the finger m is supported above the feed-board a distanceexactly equal to the thickness of a single sheet of paper designed to befed to the printing-press. By the adjustment of the set-screw the fingerm can be regulated to the varying thickness of different qualities ofpaper that may be required to be printed. The finger m constitutes oneof the electric terminals, and over the same is the other terminal 0,consisting of a set-screw adjustably connected to a cross-bar 0,supported 011 the sides of the feed-board. The set-screw 0 is to be soadjusted as to cause the finger m to come in contact therewith and thusclose the circuit by the lifting of the said finger by two sheets ofpaper passing simultaneously under the finger. Said circuit maker andbreaker is connected with the magnet N and battery E. By closing thiscircuit in the manner aforesaid the armature N is attracted by themagnet N and causes the pawl O to come in contact with the lever 0during the movement of the pitman H in one direction. Said lever isthereby turned on its pivot so as to push the belt-shipping bar Z toship the driving-belt of the printing-press from the tight pulley ontothe loose pulley. This gives the pressman the opportunity to remove themisfed sheets from the feed-board. After this the pressman can againstart the printingpress by means of the usual belt-shipping lever B.

Then my invention is to be applied to a socalled drum printing-press, ora press on which the impression-cylinder is not arranged to movevertically toward and from the typebed, I employ my automatic stopmechanism solely for shipping the driving-belt as aforesaid. This may beeffected either with two pitmen S and S, as :shown in Fig. 5 of thedrawings, or a single pitman S, as represented in Figs. 6 and 7 of thedrawings. In either case, however, two circuit makers and breakers areemployed, one of which is to be arranged to close the circuit when nosheet is fed to the press and the other to close the circuit when morethan one sheet is fed simultaneously.

When two pitmen S S are employed, I mount on each a separateelectromagnet T, the armature T of which is pivoted to the pitman and isformed with the pawl 19, by which to engage the elbow-lever O, whichmoves the belt-shipping bar Z in the manner hereinbefore described. Bothof said magnets are designed to be used and are in the same circuit, sothat in case the armature of one is broken or disabled the other magnetmay be relied on to produce the desired effect. In connection with thesemagnets I prefer to employ two independently operating circuit makersand breakers, as shown in Fig.

4 of the drawings. One of said circuit makers and breakers consists ofthe metallic finger i, secured to a transverse bar i, which is supportedon and insulated from suitable brackets secured to the top of the frameA at opposite sides of the feed-board C. One of the circuit-wires 1 isconnected to the bar 1'. Said finger rests with its free end normallyupon a metallic plate i, which has the circuit wire 2 connected to itand constitutes the stationary electric terminal, while the aforesaidfinger is the movable terminal. The purpose of this circuit maker andbreaker is to close the circuit and energize the magnets T when no paperpasses to the printing-press. The other circuit maker and breakerconsists of the metallic finger m, attached to a metallic cross-bar m,which is pivoted in and insulated from brackets mounted on the feedboardnear the side edges thereof. Awire 3 is extended from the bar m to thewire 1. Either to the finger 'm or to the bar m is rigidly securedanother bar m, extending therefrom and resting with its free end upon aninsulated set-screw 0, connected to a cross bar 0, which is supported atopposite ends on suitably-insulated posts mounted on the feed-board. Thefree end of the bar m constitutes one of the electrical terminals, andover this is the stationary terminal 0, con sisting of a set-screwadjustably connected to an arm projecting from the bare. A wire 4:connects said terminal with the wire 2. The lower set-screw 0 is soadjusted as to cause the overlying bar m to sustain the finger m in sucha position as to leave between the free end of said finger and surfaceof the feedboard a space exactly equal to the thickness of a singlesheet of paper to be fed to the printing-press and cause said finger tobe lifted when two sheets pass simultaneously under the finger. Saidlifting of the finger causes the free end of the bar m to come incontact with the terminal 0, and thus closes the circuit and causes themagnets T to be energized, the result of which latter has al.- readybeen herein described. The same ef fect, however, may be obtained by asingle pitman S,with the magnet T mounted thereon and the armature Tpivoted to the pitman, as shown in Figs. 6 and 7 of the drawings, whichalso shows my preferred means of transmitting motion to the pitman, 'i.6., a

sprocket-wheel U, attached to a shaft S,

mounted in suitable supports on the frame A, is connected by asprocket-chain t to asprocket-wheel U, which is geared to the drivingmechanism of the feeding-machine. Acam or an eccentric r, secured to theshaft 5, imparts reciprocating motion to the pitman S.

The means for electrically controlling the automatic stop mechanism mayalso be simplified by combining the two circuit makers and breakers, asshown in Fig. 6 of the drawings, in which case the feeler or terminal 1"of the normally closed circuit is formed with ICC a rearwardl y-extendin g finger p, constituting one of the terminals of the normally brokencircuit, beneath which is the set-screw or companion terminal 0. All ofsaid terminals are in the same circuit. The operation of the said twocombined circuit makers and breakers is as follows: In case no paper isfed to the printing-press, the feeler t" rests upon the terminal '21 andthus closes the cir cuit. If a single sheet is fed, it breaks thecircuit by passing between the two terminals '1" and "11, but does notlift the feeler 11 suiiiciently to bring the finger p in contact withthe set-screw or terminal 0. If, however,two or more sheets passsimultaneously between the terminals 1? and i the feeler z" is liftedsuiiiciently to bring the finger p in contact with the terminal 0, andthereby closes the circuit.

The effect of opening and closing the circuit with the magnet T in. saidcircuit and mechanism controlled thereby is substantially the same ashereinbefore described.

In each of the described electrically-controlled stop mechanisms theusual. spring or weight which draws the armature from the magnet causesthe pawl attached to said armature to be thrown into a position toprevent its engagement with the lever which actuates the stop motion.

hat I claim as my invention is- 1. The combination with aprinting-press, paper feeding machine, intervening feed,- board, andtapes conveying the paper over said feed-board, of a vertically-movablefeeler disposed over said feed-board and lifted by the paper forcedunder it by the tapes, an electric circuit, a circuit maker and breakeractuated by the aforesaid feeler, a primary stop mechanism for throwingthe impression cylinder out of operation upon the typeforms, anauxiliary stop mechanism moving in unison with the press mechanism, anelectromagnet in the aforesaid circuit and traveling with one of saidstop mechanisms and the armature of said magnet provided with a catchfor engaging and releasing the other of said stop mechanisms as setforth.

2. The combination with a printing-press, paperfeeding machine,intervening feedboard, and tapes conveying the paper over saidteed-board, of a vertically-yielding feeler over the feed-board andlifted by the paper forced under it by the tapes, an electric circuit,and a circuit maker and breaker actuated by said feeler, mechanismactuated by the press mechanism and moving the impression-cylinder toand from the type-forms, stop mechanism for arresting the saidcylindermovingmechanism and actuated independent of the press mechanism,and an electromagnet having its armature movable to and from a positionto transmit motion from said step mechanism to the aforesaidcylinder-nuning mechanism as set forth.

3. The combination with a printing-press, paper-feeding machine andintervening feedboard, of an electric circuit, a circuit maker andbreaker actuated by a feeler over the feedboard and yielding verticallyto the contact with the paper in transit, mechanism operated by thepress mechanism and moving the impression-cylinder to and from thetype-forms, a lever disconnecting said mechanisms independently of thepress mechanism, a pitman moving in unison with. the latter mechanism,and an eleciromagnet mounted on. said pi itman and having its armaturemovable to and from a position for transmitting motion from the pitmanto the aforesaid lever as set forth.

4:. In combination, with a vertically-movable iinpression-cylinder,paper-feeding machine, intervening feed-board, toggle-levers forliftingsaid cylinder, at rock-arm actuated by the press mechanism and a pitmanconnected to the toggle-levers and provided with a catch for engagingand releasing the aforesaid rock-arm, a lever movable independent of thepress mechanism, and adapted to release said pitman from the rock-arm, apitman moving in unison with the press mechanism, an electric circuit,an elcctromagnet in said circuit mounted on the latter pitman, thearmature of said magnet provided with a catch for engaging and releasingsaid lever, and a circuit maker and breaker controlled by the transit ofthe paper over the feed-board as set forth and shown.

5. In combination with a printing-press, having a vertically-niovableimp1'essioncylinder, paper-feeding machine, intervening feed-board,mechanism for raising and lowering the impression-cyliiuler anddetachabiy connected to the press mechanism, a lever for effecting saiddisconnection, and a tripping mechanism operating said lever independentof the press mechanism, an electric circuit, an electromaguet in saidcircuit and having its armature provided with a pawl to engage andrelease the tripping mechanism, and a circuit maker and breaker havingone termi nal within the plane of the feed-board and the other terminalmovable vertically over the first-named terminal and normally in contacttherewith as set forth.

In testimony whereof I have hereunio signed my name this 4th day ofApril, 1805.

TALBOT O. DEXTER. [Ls] lVitnesses:

J AS. 1 WHI'rLocK, M. E. MORRISON.

